Sash-balance



(No Model.)

P. B. COCHRAN.^

i sAsH BALANCE. No.. 255,721. N Patented Mfa,r.28,1882.4

i" WITNESSES IN VENTOR ,MQ aww@ i N. PETERS, Phntn-lhngrlpher. Washington, D, C

UNITED STATES PATENT OFFICE.

FREDERIC B.V COCHRAN, OF BOSTON, MASSACHUSETTS.

SMH-BALANCE.

SPECIFICATION forming part of Letters Patent No. 255,721, dated March 28, 1882. Application filed December 28,1881. (No model.)

To all whom it may concern Be it known that I, FREDERIC BOARDMAN COCHRAN, a citizen of the United States, residing at Boston,in the county ot' Suffolk and State of Massachusetts, have invented a new and Improved Sash-Balance, of which the following is a specification.

My invention relates toimprovements in halancing window-sashe's in their frames, and t0 Io the automatic raising, retaining, and locking ofthem at any desired height or point within the scope of their movement; and my improvements consist in the details of construction and general arrangement ofparts, all ashereinafter `I5 fully shown and described, and pointed out in the claim.

In the accompanying drawings, Figure l is a side view of my invention as it appears after the removal of one side of the casein which it 2o is inclosed. Fig. 2 is a front view without the removal of the case. Fig. 3 is a back view of the same. Figs.'4 and 5 are accessory parts of my invention for controlling` and retaining the movement ofthe cog-wheel c and holding the sash in place, which will be fully described hereinafter.

Similar letters rei'er to similar parts. A represents a case, in which is inclosed a cog-wheel, a, suspended on a `journal, c, between two spiral springs, b b, which are arranged in such a manner that they will have a tendency to turn the cog-wheel a, 011e end of the springs being attached to the journal c and the other end to the piu d. The cases being placed in position in the frame of the window,

the wheel c engages in a rack, B, in the sidesV ofthe sash. The sash on being lowered winds up the springs b b, and these tend to-turn the wheel a and raise the sash in the fra-me.

VI consider as a very necessary and important 4o part of my invention my device for controlling and holding the sash in pla-ce, and which I have arranged in the following manner.

Figs. 4 and 5 are respectively side and frontV views of the pawl C. In Figs. 1 and 2 pawl C is journale'd in suitable'slots in the case A, and the end e ofthe pawl C is held firmly down and against the cogs in the wheel a by one coil of the springs b b passing over the armsff. On turning the knob D the point e of the pawl C is disengaged. from the cogs of the wheel a, allowing said wheel the freedom of action hereinbeiore described. t.

The sash cannot be raised when at any point except upon manipulation of the knob D.

In order to lock the upper sash to prevent it from being lowered from the outside, the pawls C in the balances for said sash are provided with a double point, 'as shown in Fig. 4 at e.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1n a sash-balance, the combination, with the window-sash provided with the rack B, of the cog-wheel a., adapted to engage said rack,|coiled springs b, connected at one end to the journal ot said cog-wheel, and pawl C, having operating-knob D and projecting arlnsf, over which said springs pass and bear thereon, substantially in the manner as and for the purpose 7o herein shownand described.

FREDERIC B. COCHRAN. [L.

Witnesses:

J. E. HEssEL'IINE, F. L. MGVEY. 

